JB Gill explores the Sussex coast in Brighton, home to beach huts, saunas and the i360 - Europe's tallest moving observation tower. In Merseyside, Helen Skelton joins the crew of the RNLI's high-speed Shannon lifeboat. Jules Hudson visits the Portsmouth Historic Dockyard on the Dorset coast, uncovering a personal chapter of naval history and tracing the story of his great-uncle George Norcott.

On the Lancashire coast, Helen Skelton heads to Fleetwood's Rossall Coastwatch Tower, where she joins the local National Coastwatch volunteers to learn the skills needed to keep eyes on the water. JB Gill explores the cliffs of Porthcawl, South Wales, where layers of ancient limestone reveal a forgotten prehistoric world. In Dorset, Jules Hudson musters his courage for a paragliding flight above the Jurassic coast.